<!DOCTYPE HTML>
<html lang="en-US">
<head>
	<meta charset="UTF-8">
	<title>案例实战：box制作自适应的三列布局</title>
</head>
<body>
	<div id="header">
		<h1>Header</h1>
	</div>
	<div id="page">
		<div id="main">
			<h1>主内容</h1>
		</div>
		<div id="sidebar-left">
			<h1>左边栏</h1>
		</div>
		<div id="sidebar-right">
			<h1>右边栏</h1>
		</div>
	</div>
	<div id="footer">
		<p>我是页面页脚</p>
	</div>
</body>
</html>